CN107681648B - A kind of power of alterating and direct current partition method being shorted test for substation secondary - Google Patents

A kind of power of alterating and direct current partition method being shorted test for substation secondary Download PDF

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Publication number
CN107681648B
CN107681648B CN201711117917.XA CN201711117917A CN107681648B CN 107681648 B CN107681648 B CN 107681648B CN 201711117917 A CN201711117917 A CN 201711117917A CN 107681648 B CN107681648 B CN 107681648B
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China
Prior art keywords
circuit
voltage
shorted
test
direct current
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CN201711117917.XA
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CN107681648A (en
Inventor
冯凝
刘颖彤
吴峥
蔡昂
王峦
李挺
罗浪
孙双学
陈前臣
石旭刚
王添慧
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WUHAN HAOMAI ELECTRIC POWER AUTOMATION Co Ltd
State Grid Corp of China SGCC
Maintenance Branch of State Grid Hubei Electric Power Co Ltd
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WUHAN HAOMAI ELECTRIC POWER AUTOMATION Co Ltd
State Grid Corp of China SGCC
Maintenance Branch of State Grid Hubei Electric Power Co Ltd
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Priority to CN201711117917.XA priority Critical patent/CN107681648B/en
Publication of CN107681648A publication Critical patent/CN107681648A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/008Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result preventing unsafe switching operations in substations (Schaltfehlerschutz)
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/04Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned

Abstract

The invention belongs to secondary equipment in power system service technique fields, disclose a kind of power of alterating and direct current partition method that test is shorted for substation secondary, when the both ends for being shorted test are direct current or are exchange, are shorted circuit conducting;When described one end for being shorted test is exchange, one end is direct current, the short circuit circuit is disconnected, and audible and visual alarm circuit issues audible and visual alarm information.The present invention, which solves, to be shorted test in the prior art and is easy to appear maloperation, thus the problem of causing the AC in the DC system, can guarantee being effectively isolated for alternating current and direct current power supply when maloperation.

Description

A kind of power of alterating and direct current partition method being shorted test for substation secondary
Technical field
The present invention relates to secondary equipment in power system service technique fields, more particularly to a kind of substation secondary that is used for be shorted The power of alterating and direct current partition method of test.
Background technique
Transformer station direct current system is isolated neutral system, is supervised online by battery, charging unit, DC loop, direct current system It surveys the part such as device to form, for breaker control, relay protection, device signal etc..AC system is earthed system, for shining Bright, printing, fan etc..When alternating voltage seals in direct current system, by secondary cable, distribution capacity is formed into a loop over the ground, will be drawn False protection, switch mis-jumping are played, may cause the great of more breaker fault-free trips or even whole station power loss in standing when serious Safety accident.
In service work, for the closed state of simulator contact, or the integrality of test secondary circuit, often It needs to carry out short circuit test between connecting terminal.AC and DC circuit is two mutually independent systems, but in substation secondary System is typically arranged in same protection screen, control cabinet or terminal box when designing.Especially put into operation time substation earlier, connects Line terminals, which are commonly present, arranges phenomenon lack of standardization, mark is unintelligible, drawing is inaccurate, and when alternating current-direct current terminal is shielding distance in cabinet More recently condition, staff are easy accidentally to be shorted alternating current-direct current circuit when carrying out short-circuit operation.
To prevent the AC in the DC system in maintenance process, the means of strengthening management are relied primarily at present, promote safety wind Danger consciousness is to be managed, but AC and DC terminal in the cold control cabinet of secondary terminals dense arrangement, especially main transformer, blower, thermometer It is positioned adjacent to, it is difficult to fundamentally take precautions against maloperation.In addition, the longer substation of the time limit that much puts into operation be commonly present drawing it is incomplete or Wrong situation, these all bring great security risk.To prevent the safety accident that may cause, it is necessary to pass through technology The phenomenon that means identify and take precautions against the AC in the DC system caused by short circuit test maloperation.
Summary of the invention
The embodiment of the present application is by providing a kind of power of alterating and direct current partition method for being shorted test for substation secondary, solution It has determined to be shorted to test in the prior art and has been easy to appear maloperation, thus the problem of causing the AC in the DC system.
The embodiment of the present application provides a kind of power of alterating and direct current partition method that test is shorted for substation secondary, works as short circuit When the both ends of test are direct current or are exchange, it is shorted circuit conducting;When described one end for being shorted test is exchange, one end is When direct current, the short circuit circuit is disconnected, and audible and visual alarm circuit issues audible and visual alarm information;
The circuit that is shorted connects the both ends for being shorted test, and the short circuit circuit is in parallel with voltage triggered circuit;Institute State audible and visual alarm circuit respectively with manual control circuit, power sources in parallel;
The voltage triggered circuit and the manual control circuit are accused for short circuit circuit, the acousto-optic described in co- controlling Alert circuit is turned on or off;
The voltage triggered circuit includes rectifier diode, current-limiting resistance, voltage detection unit, ac filter unit;Four Only the rectifier diode is connected with four current-limiting resistances respectively, and forms bridge circuit;The voltage detection unit and The both ends of the ac filter unit parallel connection access rectifier bridge;
The short circuit circuit includes voltage triggered normally closed contact;
The manual control circuit includes button, intermediate relay, encourages trigger relay, the first divider resistance by force, and according to Secondary series connection;The button is connect with one end of the power supply, and the other end of first divider resistance and the power supply connects It connects;
The power supply is DC power supply;
The audible and visual alarm circuit includes voltage triggered normal opened contact, light emitting diode, intermediate relay normally closed contact, bee Ring device, the second divider resistance, third divider resistance;The voltage triggered normal opened contact is connect with one end of the power supply;It is described One end of intermediate relay normally closed contact is connect with the buzzer, the other end of the intermediate relay normally closed contact respectively with The voltage triggered normal opened contact, light emitting diode connection;The buzzer by the third divider resistance with it is described The other end of power supply connects;The light emitting diode and the concatenated branch of the second divider resistance are in parallel with the buzzer Afterwards, it is connect using the third divider resistance with another pole of the power supply;
The intermediate relay is used to control the disconnection and conducting of the intermediate relay normally closed contact;
The voltage detection unit and the trigger relay of encouraging by force are for voltage triggered normally closed contact described in co- controlling With the voltage triggered normal opened contact;The voltage detection unit or it is described encourage trigger relay triggering by force after, voltage touching Send out normally closed contact disconnection, voltage triggered normal opened contact conducting.
Preferably, the current-limiting resistance uses mega-ohms resistance.
Preferably, the ac filter unit uses the nonpolarity electron capacitance of large capacity.
Preferably, the power of alterating and direct current partition method the following steps are included:
The button of the manual control circuit is pinned, to force to disconnect the short circuit circuit;
Examine the integrity in the voltage triggered circuit;
The both ends for being shorted test are connect with short-circuited terminal respectively;
The button for unclamping the manual control circuit, carries out short circuit test.
Preferably, if the integrity for examining the voltage triggered circuit includes: the described of the audible and visual alarm circuit Lumination of light emitting diode, and the buzzer no alarm, then the function in the voltage triggered circuit is normal.
Preferably, the short circuit, which is tested, includes:
When the both ends for being shorted test are direct current or are exchange, the voltage at the voltage detection unit both ends is low In given threshold, the short circuit circuit conducting;
When described one end for being shorted test is exchange, one end is direct current, the voltage at the voltage detection unit both ends is high In given threshold, the voltage triggered normally closed contact is disconnected, and the short circuit circuit disconnects;The voltage triggered normal opened contact is led It is logical, the lumination of light emitting diode in the audible and visual alarm circuit, and the buzzer issues alarm, disconnects the short circuit in time The both ends of test and the connection of short-circuited terminal.
Preferably, the voltage at the voltage detection unit both ends are as follows:
U=rms (k | u1-u2|) (1)
Wherein, the both ends for being shorted test are respectively the end V1, the end V2, u1For the voltage at the end V1, u2For the end V2 Voltage, u be the voltage detection unit both ends voltage, k be partial pressure coefficient.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
In the embodiment of the present application, a kind of power of alterating and direct current partition method that test is shorted for substation secondary is proposed, According to the otherness for being shorted test both end voltage value, when both ends are direct current or are exchange, automatic short circuit is connected;Work as one end To exchange, its electrical communication of blocking is triggered when one end is direct current, and issues audible and visual alarm, guarantees AC and DC power supply when maloperation Be effectively isolated.
Detailed description of the invention
It, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution in the present embodiment Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is one embodiment of the present of invention, for this field For those of ordinary skill, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of power of alterating and direct current partition method that test is shorted for substation secondary provided in an embodiment of the present invention Flow chart;
Fig. 2 is a kind of power of alterating and direct current partition method that test is shorted for substation secondary provided in an embodiment of the present invention The circuit block diagram of use;
Fig. 3 is a kind of power of alterating and direct current partition method that test is shorted for substation secondary provided in an embodiment of the present invention The voltage oscillogram at middle voltage detection unit both ends.
Wherein, 1- voltage triggered normally closed contact, 2- current-limiting resistance, 3- rectifier diode, 4- voltage detection unit, 5- exchange Filter unit, 6- encourage by force trigger relay, 7- intermediate relay, 8- button, the first divider resistance of 9-, and 10- voltage triggered is normally opened Contact, 11- intermediate relay normally closed contact, 12- buzzer, 13- light emitting diode, the second divider resistance of 14-1-, 14-2- Three divider resistances, 15- power supply, when 16-V1, V2 voltage are respectively positive and negative 55V, the voltage at voltage detection unit both ends, 17-V1 Or V2 is terminated when exchanging into 220V, the voltage at voltage detection unit both ends.
Specific embodiment
The embodiment of the present application is by providing a kind of power of alterating and direct current partition method for being shorted test for substation secondary, solution It has determined to be shorted to test in the prior art and has been easy to appear maloperation, thus the problem of causing the AC in the DC system.
The technical solution of the embodiment of the present application is in order to solve the above technical problems, general thought is as follows:
A kind of power of alterating and direct current partition method being shorted test for substation secondary, when the both ends for being shorted test are straight When flowing or being exchange, it is shorted circuit conducting;When described one end for being shorted test is exchange, one end is direct current, the short circuit Circuit disconnects, and audible and visual alarm circuit issues audible and visual alarm information;
The circuit that is shorted connects the both ends for being shorted test, and the short circuit circuit is in parallel with voltage triggered circuit;Institute State audible and visual alarm circuit respectively with manual control circuit, power sources in parallel;
The voltage triggered circuit and the manual control circuit are accused for short circuit circuit, the acousto-optic described in co- controlling Alert circuit is turned on or off.
The present invention proposes a kind of power of alterating and direct current partition method that test is shorted for substation secondary, tests according to being shorted The otherness of both end voltage value is shorted circuit conducting when the both ends for being shorted test are direct current or are exchange;It is surveyed when being shorted When one end of examination is exchange, one end is direct current, triggering blocks its electrical communication, and issues audible and visual alarm, guarantee to hand over when maloperation, DC power supply is effectively isolated.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper Technical solution is stated to be described in detail.
The present invention provides a kind of power of alterating and direct current partition method that test is shorted for substation secondary, examines for substation The mixed connection risk of station AC and DC power supply system during repairing, the voltage characteristic according to substation's AC and DC power supply system are poor It is different, the on-off for being shorted test link circuit is automatically controlled, is ensured when short circuit test macro both ends AC and DC characteristic is inconsistent short It takes back road not to be connected to, and issues audible and visual alarm auxiliary repair personnel and judge whether there is maloperation, be shorted process and surveyed without artificial Amount and differentiation avoid tradition maintenance and are shorted the safety accident caused under test mode by artificial maloperation.
Specifically, when the both ends for being shorted test are direct current or are exchange, the voltage detection unit both ends Voltage be lower than given threshold, two terminal circuits by closure voltage triggered normally closed contact keep connection, the short circuit circuit is led It is logical.When described one end for being shorted test is exchange, one end is direct current, the voltage at the voltage detection unit both ends is higher than setting Threshold value, the voltage triggered normally closed contact disconnect, and the short circuit circuit disconnects;The voltage triggered normal opened contact conducting, it is described The lumination of light emitting diode in audible and visual alarm circuit, and the buzzer issues alarm, disconnects the short circuit test in time The connection at both ends and short-circuited terminal.
Fig. 1 is a kind of process of power of alterating and direct current partition method that test is shorted for substation secondary provided by the invention Figure.The following steps are included: connect manual control circuit, self-check of device, start be shorted, disconnect manual control circuit, according to whether Alarm is completed to be shorted test or stops being shorted.The present invention carried out under conditions of the manual control circuit is connected self-check of device with It is shorted, it is ensured that the short circuit circuit reliably disconnects before the voltage detection unit works normally, and is connected firmly to short-circuited terminal After can disconnect the manual control circuit.The voltage detection unit can reflect both end voltage situation, to voltage triggered contact It is controlled with audible and visual alarm signal.
The present invention proposes a kind of test dress that the power of alterating and direct current partition method for being shorted test for substation secondary uses It sets as shown in Figure 2, comprising: be shorted circuit, voltage triggered circuit, manual control circuit, power supply 15, audible and visual alarm circuit;It is described The both ends that circuit connection is shorted test are shorted, the voltage triggered circuit is in parallel with the short circuit circuit;It is described to manually control back Road, the power supply 15, the audible and visual alarm circuit are in parallel.
Wherein, the short circuit circuit includes voltage triggered normally closed contact 1.The voltage triggered circuit include current-limiting resistance 2, Rectifier diode 3, voltage detection unit 4, ac filter unit 5.The manual control circuit include by force encourage trigger relay 6, Intermediate relay 7, button 8, the first divider resistance 9.The alarm circuit includes voltage triggered normal opened contact 10, intermediate relay Normally closed contact 11, buzzer 12, light emitting diode 13, the second divider resistance 14-1, third divider resistance 14-2.The power supply 15 For DC power supply.
The voltage triggered circuit and the short circuit circuit, which are connected in parallel to, is shorted test object both ends V1, V2, and four described whole Stream diode 3 is connected with four current-limiting resistances 2 respectively, forms bridge circuit;The parallel connection of rectifier bridge both ends accesses the voltage Detection unit 4 and the ac filter unit 5.
The power supply 15, the manual control circuit are in parallel with the alarm circuit.
Described in the manual control circuit encourages trigger relay 6, the intermediate relay 7, the button 8, institute by force It states the first divider resistance 9 and forms series loop.
One pole of the power supply 15 is connect with the voltage triggered normal opened contact 10 in the alarm circuit, the voltage Triggering normal opened contact 10 is connect with the light emitting diode 13, the intermediate relay normally closed contact 11, the intermediate relay Normally closed contact 11 is connect with the buzzer 12, and the buzzer 12 is by the third divider resistance 14-2 and the power supply 15 Another pole connection;The light emitting diode 13 and the concatenated branch of the second divider resistance 14-1 and the buzzer 12 are simultaneously After connection, it is connect using the third divider resistance 14-2 with another pole of the power supply 15.
The voltage detection unit 4 with it is described encourage by force voltage triggered normally closed contact 1 described in 6 co- controlling of trigger relay and The voltage triggered normal opened contact 10, the voltage detection unit 4 and it is described by force encourage trigger relay 6 any one triggering after, institute The disconnection of voltage triggered normally closed contact 1 is stated, the voltage triggered normal opened contact 10 is connected;The intermediate relay 7 controls in described Between relay normally closed contact 11 disconnection and conducting.
The voltage detection unit 4 is connected using the big valued resistor of voltage triggered relay series connection with current-limiting resistance composition The voltage difference at the both ends V1, V2 is reflected rectifier bridge in circuit in a manner of dividing;The ac filter unit 5 uses large capacity Nonpolarity electron capacitance acts on when circuit seals in exchange Shi Qiping wave, the voltage u at 4 both ends of voltage detection unit is kept to begin Eventually more than given threshold.
The value of voltage u can approximation regard as:
U=rms (k | u1-u2|) (1)
Wherein, u1For the end V1 voltage, u2For the end V2 voltage, u is voltage detection unit both end voltage, and k is partial pressure coefficient.
Fig. 3 is the voltage oscillogram at heretofore described 4 both ends of voltage detection unit.Work as u1=55V, u2When=- 55V, electricity Press the stable state waveform of u as shown in lines 16;Work as u1Or u2In one end access 220V exchange when, it is specific such as u1=~220V, u2For When 55V or -55V, the stable state waveform of voltage u is as shown in lines 17.
When the one end for being shorted test is exchange, one end is direct current, the voltage at 4 both ends of voltage detection unit, which is higher than, to be set Determine threshold value, controls the voltage triggered normally closed contact 1 and disconnect, the short circuit circuit can not be connected to, while in the alarm circuit The light emitting diode 13 and the buzzer 12 be connected through the voltage triggered normal opened contact 10, issue audible and visual alarm.When The both ends for being shorted test are when exchanging or being direct current, and the voltage at 4 both ends of voltage detection unit is lower than given threshold, institute State the voltage triggered normally closed contact 1 holding connection for being shorted circuit by closure.
It is described when the function in the audible and visual alarm circuit includes: that the voltage at 4 both ends of voltage detection unit is higher than threshold value Light emitting diode 13 and the buzzer 12 are simultaneously emitted by alarm, and there are 220V AC voltages for expression system.It presses described manual When button Final 8 system in control loop disconnects the short circuit circuit, the light emitting diode 13 is connected, but the buzzer 12 do not alert, and indicate that the system is in test mode, and circuit basic function is normal.
The function of the manual control circuit includes: to examine for system circuit, is connected in the access of the end V1, V2 no-voltage The manual control circuit, if return circuit is normal, the light emitting diode 13 shines, and 12 no alarm of the buzzer;? Force to disconnect the short circuit circuit in advance before being shorted test, avoid the end V1, V2 with to short-circuited terminal Contact, because of poor contact The problems such as cause the voltage detection unit 4 to be judged by accident, disconnect the manual control circuit again after connection to be confirmed is good.Its work Principle are as follows: described to encourage trigger relay 6 and the intermediate relay 7 by force after the button 8 of the manual control circuit is pressed Movement;The trigger relay 6 of encouraging by force controls the voltage triggered normally closed contact 1 and the voltage triggered normal opened contact 10, institute Voltage triggered normally closed contact 1 is stated for disconnecting the short circuit circuit by force manually, the voltage triggered normal opened contact 10 is for leading Lead to the light emitting diode 13;The intermediate relay that the intermediate relay 7 controls the audible and visual alarm circuit normally closed connects Point 11, for disconnecting the sound alarm of the buzzer 12 when manually controlling.
Since the current-limiting resistance 2 is all made of the big resistance of mega-ohms, the voltage triggered circuit is believed that short circuit Circuit does not have an impact.Equally, test result, which shows the system also, does not influence the voltage level of AC and DC system itself.
A kind of power of alterating and direct current partition method for substation secondary short circuit test provided in an embodiment of the present invention is at least Including following technical effect:
In the embodiment of the present application, a kind of power of alterating and direct current isolation side that test is shorted for substation secondary is proposed Method reflects the feature of connect both end voltage by voltage detection unit without artificial measurement and judgement, to the on-off for being shorted circuit It carries out automatically controlling, and issues acousto-optic alarm signal assist operators and differentiate, to avoid caused by artificial incorrect operation Alternating current-direct current mixed connection accident is suitable for substation station 220V AC system and direct current system, and circuit theory is simply direct, has Higher reliability.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it, Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover In the scope of the claims of the present invention.

Claims (7)

1. a kind of power of alterating and direct current partition method for being shorted test for substation secondary, which is characterized in that when short circuit test When both ends are direct current or are exchange, it is shorted circuit conducting;When described one end for being shorted test is exchange, one end is direct current When, the short circuit circuit disconnects, and audible and visual alarm circuit issues audible and visual alarm information;
The circuit that is shorted connects the both ends for being shorted test, and the short circuit circuit is in parallel with voltage triggered circuit;The sound Light alert circuit respectively with manual control circuit, power sources in parallel;
The voltage triggered circuit and the manual control circuit are returned for short circuit circuit, the audible and visual alarm described in co- controlling Road is turned on or off;
The voltage triggered circuit includes rectifier diode, current-limiting resistance, voltage detection unit, ac filter unit;Four institutes It states rectifier diode to connect with four current-limiting resistances respectively, and forms bridge circuit;The voltage detection unit and described The both ends of ac filter unit parallel connection access rectifier bridge;
The short circuit circuit includes voltage triggered normally closed contact;
The manual control circuit includes button, intermediate relay, encourages trigger relay, the first divider resistance by force, and is successively gone here and there Connection connection;The button is connect with one end of the power supply, and first divider resistance is connect with the other end of the power supply;
The power supply is DC power supply;
The audible and visual alarm circuit includes voltage triggered normal opened contact, light emitting diode, intermediate relay normally closed contact, buzzing Device, the second divider resistance, third divider resistance;The voltage triggered normal opened contact is connect with one end of the power supply;In described Between one end of relay normally closed contact connect with the buzzer, the other end of the intermediate relay normally closed contact respectively with institute State voltage triggered normal opened contact, light emitting diode connection;The buzzer is by the third divider resistance and the electricity The other end in source connects;After the light emitting diode is in parallel with the buzzer with the concatenated branch of the second divider resistance, It is connect using the third divider resistance with another pole of the power supply;
The intermediate relay is used to control the disconnection and conducting of the intermediate relay normally closed contact;
The voltage detection unit and the trigger relay of encouraging by force are for voltage triggered normally closed contact and institute described in co- controlling State voltage triggered normal opened contact;The voltage detection unit or it is described by force encourage trigger relay triggering after, the voltage triggered is normal Close contact disconnection, voltage triggered normal opened contact conducting.
2. the power of alterating and direct current partition method according to claim 1 for being shorted test for substation secondary, feature exist In the current-limiting resistance uses mega-ohms resistance.
3. the power of alterating and direct current partition method according to claim 1 for being shorted test for substation secondary, feature exist In the ac filter unit uses the nonpolarity electron capacitance of large capacity.
4. the power of alterating and direct current partition method according to claim 1 for being shorted test for substation secondary, feature exist In, the power of alterating and direct current partition method the following steps are included:
The button of the manual control circuit is pinned, to force to disconnect the short circuit circuit;
Examine the integrity in the voltage triggered circuit;
The both ends for being shorted test are connect with short-circuited terminal respectively;
The button for unclamping the manual control circuit, carries out short circuit test.
5. the power of alterating and direct current partition method according to claim 4 for being shorted test for substation secondary, feature exist In if the integrity for examining the voltage triggered circuit includes: the light emitting diode hair in the audible and visual alarm circuit Light, and the buzzer no alarm, then the function in the voltage triggered circuit is normal.
6. the power of alterating and direct current partition method according to claim 4 for being shorted test for substation secondary, feature exist In the short circuit test includes:
When the both ends for being shorted test are direct current or are exchange, the voltage at the voltage detection unit both ends, which is lower than, to be set Determine threshold value, the short circuit circuit conducting;
When described one end for being shorted test is exchange, one end is direct current, the voltage at the voltage detection unit both ends, which is higher than, to be set Determine threshold value, the voltage triggered normally closed contact disconnects, and the short circuit circuit disconnects;The voltage triggered normal opened contact conducting, institute The lumination of light emitting diode in audible and visual alarm circuit is stated, and the buzzer issues alarm, disconnects the short circuit test in time Both ends and short-circuited terminal connection.
7. the power of alterating and direct current partition method according to claim 6 for being shorted test for substation secondary, feature exist In the voltage at the voltage detection unit both ends are as follows:
U=rms (k | u1-u2|) (1)
Wherein, the both ends for being shorted test are respectively the end V1, the end V2, u1For the voltage at the end V1, u2For the electricity at the end V2 Pressure, u are the voltage at the voltage detection unit both ends, and k is partial pressure coefficient.
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